Brake Booster Pressure Sensor Performance
The brake booster vacuum or pressure sensor signal does not respond plausibly to engine vacuum or electric booster activity.
Affected components
- Brake booster vacuum sensor
- Vacuum pump
Common causes
- High likelihood: Vacuum leak in booster line
- Medium likelihood: Vacuum pump weak
- Low likelihood: Sensor element aged beyond calibration window
Possible symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.